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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).
In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.